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Finding the Fourth Proportional to 78,990.88, 118,430.40 and 39,519.68

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Solution

The fourth proportional to 78,990.88, 118,430.40 and 39,519.68 is: 59,251.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,990.88 : 118,430.40 = 39,519.68 : x
  2. Step 2: Convert to fraction form
    78,990.88/118,430.40 = 39,519.68/x
  3. Step 3: Cross multiply
    78,990.88x = 118,430.40 × 39,519.68
  4. Step 4: Simplify right side
    78,990.88x = 4,680,331,510.27
  5. Step 5: Solve for x
    x = 4,680,331,510.27/78,990.88
  6. Step 6: Final answer
    x = 59,251.54

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.